Improvement in sawing-machines



G. MARSHALL.

Sawing-Machines N0. 139,965 Paten[ed.lune17,1873.

Witnesses: Envenmn Per AM PHOTO-UTIIOGRAPH/C 00 NM ('osaonne PRucEss')STATES PATENT ()FFICE- GEORGE MARSHALL, OF NEW YORK, N. Y.

IMPROVEMENT IN SAWlNG MACHINES.

Specification forming part of Letters Patent No. 139,965, dated June 17,1873; application filed April 12, 1873.

' connection.

Similar letters of reference indicate corresponding parts.

This invention relates to an improvement in the mechanism for slidingthe bearings of the saw-mandrel. in a ripping and cross-cutting machine;and consists in the connection of the sliding carriage andits beltingwith a powerful foot-lever and friction-rollers, by which the saw can bemoved and operated in both directions, and adjusted rapidly for thedifferent purposes to which the machine is applicable.

In the drawing, A represents the frame of the machine of the usualshape; B, the saw titted suitably into the sliding-carriage O, whichmoves lengthwise ingnides d d. D is the belt which passes over a roller,a, of the driving-shaft b,- then over a roller, a, of the sa'w'mandrelN,- then over roller a of the .sliding carriage O and roller a of shaft12 of frame A, rotatingthe saw B, and adapting itself to the rectilinearmotion of the carriage C. E and E are two belts stretched longitudinallybetween downward-projectin g pieces 9 of carriage- They are incontactwith frictionrollers e and 0, respectively, whose shafts turn injournals of frame A. Between these rollers e e is hung a double rollerF, the shaft b of which is connected with lever G, and constantlyrotated by belt h, or other connection with the driving-shaft b. Thefront end of lever Gris connected to a treadle I, which is operated bythe attendant by pressing roller F either against belt E and the upperfriction-roller e, or against belt E and the lower friction-roller 6.Whenever roller F is brought up against belt E, the friction exertedupon it by the rollers F and e compels the saw to move forward, but itsmotion is reversed when roller F is brought down on belt E and roller 6.In place of belts E and E, equivalent gearing may be employed. K is therule used in cross-cutting. It is hinged to the side of frame A, and maybe folded up against it when the machine is used for rip ping. L is acap also hinged to the frame at the front end thereof to be folded overtoward the saw to protect the attendant and serve, in connection withrule K, as a rest in cross-cutting; it is folded down out of the waywhen the machine is used for ripping.

The operations of ripping and cross-cutting may therefore beaccomplished with rapidity and ease,'resulting in a saving of time andlabor.

Having thus described my invention, I claim as new, and desire to secureby Letters Patent- 1. The foot-lever G having double roller F, combinedwith friction-rollers e e to impart forward and reverse motion tocarriage G, as set forth.

2. The saw-carriage 0 having projecting pieces 9 for stretching belts EE, with rollers a and a of the mandrel 11 for adjustment of driving-beltD, as described.

3. The hinged guide K and cap L arranged, as shown and described, tooperate as specified.

GEORGE MARSHALL. Witnesses:

' PAUL GoEPEL, T. B. MOSHER.

